Objective The research is to understand students' mobile learning (M-learning) attitudes and behaviors,and provide a reference for the development of mobile learning systems and learning resources.Methods The research used the method of questionnaires to investigate nursing students' present situation of M-learning.Results About 2/3 of the students were so eager to have targeted mobile tutorial course.Most of the students were not satisfied though there were a lot of resources.More than 2/3 of the students used telephone to surf on the internet almost every day (mainly on reading web pages and communicate with classmates using chat software,see / write blog lowest).The mobile learning time of more than 60％ students was not more than 10 minutes.1/3 of students used the time between 10 to 30 minutes.The highest cost that students spent on monthly mobile learning was less than 10 Yuan,accounting for the total number of 1/3.Compared with the junior college students,the proportion of undergraduates who support to use phone to surf on the internet was higher.Undergraduate students were more likely to read pages and see multimedia,most of them hope to see courseware within 2 to 5 minutes,etc.Conclusions Nursing students have good hardware conditions on mobile learning.Students are recognized on mobile learning.The current mobile learning resources are chaos and lack of design so that it hindered the development of mobile learning.Mobile learning courses should be short and pithy,rich and colorful.Application design of mobile blog in mobile learning needs to be strengthened.Generally speaking,undergraduate college students are more actively to take mobile learning into their learning and life.

BACKGROUND:Bioglass has good biocompatibility and biological activity, which can be combined with calcium phosphate bone cement to form an absorbable bioglass that has the advantages of both materials and is expected to have a better use of space. OBJECTIVE:To explore the mechamism of the new type of absorbable bioglass injection for vertebral body supporting and osteogenic induction in osteoporosis rats. METHODS:Twenty-seven female Sprague-Dawley rats were selected to make osteoporosis models by bilateral ovariectomy, and after 1 month, the rats were randomized into three groups. Bone defect models were established in the lumbar L4 segment of al the rats. Rats in the experimental group were subjected to absorbable bioglass injection; rats in the control group 1 underwent polymethylmethacrylate bone cement injection; and rats in the control group 2 were given injectable calcium phosphate. Twelve weeks after implantation, the compressive strength, degradation and osteogenesis of the implant materials were detected, and levels of serum bone morphogenetic protein-2 and transforming growth factor-β were measured. RESULTSAND CONCLUSION: The compressive strength, hydroxyapatite deposition amount, and weight loss ratio in the experimental group were significantly higher than those in the two control groups (P < 0.05); the relative volume, thickness and number of bone trabeculae in the experimental group were significantly higher than those in the control groups (P < 0.05); the bone morphogenetic protein-2 and transforming growth factor-β protein levels in the experimental group were significantly higher than those in the two control groups (P < 0.05). These findings indicate that the new-type absorbable bioglass can greatly strengthen the vertebral body supporting and promote osteogenic effect in osteoporosis by enhancing the bone morphogenetic protein-2 and transforming growth factor-β protein levels.

Objective: To determine the impurities in pharmaceutical adjuvant sodium bisulfite. Methods: An IC method was used with a Dionex IonPac AS17-C RFIC analytical column. ECD was used as the detector by gradient elution and the temperature of column was 30℃. Results:Sulfate radical was detected out in all samples. Conclusion:The method is simple and fast with high sensi-tivity, which is suitable for the determination of related substances in sodium bisulfite.

Background Phakic posterior chamber implantable contact lens (PPC-ICL) or phakic posterior chamber Toric implantable contact lens (PPC-TICL) implantation is an effective way for the correction of high myopia or high myopia with astigmia,but it often has residual myopic power.Excimer laser-assisted subepithelial keratectomy (LASEK) can correct the residual myopia following PPC-ICL or PPC-TICL,but its effectiveness and safety deserve attention.Objective This study was to analyze the clinical effectiveness and safety of LASEK for residual myopia after PPC-ICL implantation for extreme high myopia.Methods A prospective cases-observational study was performed,and written informed consent was obtained from each patient before any surgery.Fourteen eyes of 9 patients with residual myopia following PPC-ICL or PPC-TICL for the eyes with spherical equivalent refraction of ≥-20.00 D were collected in the Affiliated Hospital of Guizhou Medical University from July 2010 to March 2015,including PPCICL implantation in 8 eyes and PPC-TICL implantation in 6 eyes.LASEK were performed on the eyes to correct the residual myopic power.Uncorrected visual acuity (UCVA),best corrected visual acuity (BCVA),haze,the distance of intraocular lens to lens,corneal thickness,corneal topography,corneal endothelial cell counting,intraocular pressure (IOP) and fundus were examined and compared before and after surgery.The effectiveness and safety of the surgery were evaluated.Results The operation was smooth and no complication was found after surgery in all of the eyes.The UCVA and BCVA were significantly different in the eyes among before surgery,6 months after PPC-ICL implantation and 12 months after LASEK (F =31.360,1.778;both at P＜0.05),and the UCVA after LASEK was higher than BCVA before LASEK.The refractive powers were (-22.27-±4.29),(-3.75±2.25) and (-0.42±0.63) D before surgery,6 months after PPC-ICL implantation and 12 months after LASEK,showing a significant difference among them (F=46.370,P＜0.05),and the refractive power was considerably lower after LASEK than that before surgery and after PPC-ICL implantation (both at P＜0.05).No significant difference was found in IOP or corneal endothelial cell counting in operated eyes among before surgery,6 months after PPC-ICL implantation and 12 months after LASEK (F=1.663,1.055;both at P＞0.05).The distance of intraocular lens to lens was (0.69±0.26)mm in the eyes after LASEK and (0.71 ±0.29)mm in the eyes after PPC-ICL implantation,with no significant difference between them (t =0.192,P＞0.05).Conclusions PPC-ICL or PPC-TICL implantation for the correction extreme high myopia often remains a certain degree of myopia,and LASEK for the correction of residual refractive power is safe and effective.

Objective: To improve the quality standard for Zengguang tablets.Methods: Instead of the microscopic identification, Acorus tatarinowii rhizoma,Lycii Fructus and Polygalae radix were indentified by TLC.The content of schisandrin in Schisandrae Chinensis Fructus was determined by HPLC.The HPLC system consisted of a Hypersil BDS C18(250 mm×4.6 mm,5 μm)column, methanol-water (1∶1) was used as the mobile phase at a flow rate of 1.0 ml·min-1, and the detection wavelength was at 250 nm.The column temperature was 35℃ and the sample size was 10 μl.Results: The microscopic images were with strong specificity.The developed TLC spots were quite clear, and the method of TLC was simple with strong specificity and good reproducibility.The linear range of schisandrin was 21.17-423.40 ng(r=0.999 9).The average recovery was 99.7% and the RSD was 1.4%(n=6).Conclusion: The method for the quality control of Zengguang tablets is comprehensive and perfect.

Objective: To analyze the compatibility rationality between the raw material and auxiliary material sodium bisulfite in Zhengqin Fengtongning injection.Methods: HPLC was applied to detect the contents of the impurity and the main component in Zhengqing Fengtongning injection, and ion chromatography was applied to determine the content of sodium bisulfite in Zhengqing Fengtongning injection.The changes of impurity, main component and sodium bisulfite among the samples were compared before and after the stress testing (high temperature at 40℃, 60℃ and illumination at 4 500 lx).LC-MS-MS was used to identify the structures of the impurities.Results: The impurity in Zhengqing Fengtongning injection was the combination of the raw material and sodium bisulfite.Conclusion: It is irrational for Zhengqing Fengtongning injection to use sodium bisulfite as the antioxidant.

In this study, we explored the feasibility of biotin-mediated modified polymeric micelles for pancreatic cancer targeted photodynamic therapy. Poly (ethylene glycol)-distearoyl phosphatidyl ethanolamine (mPEG2000-DSPE) served as the drug-loaded material, biotin-poly(ethylene glycol)-distearoyl phosphatidyl ethanolamine (Biotin-PEG3400-DSPE) as the functional material and the polymeric micelles were prepared by a thin-film hydration method. The targeting capability of micelles was investigated by cell uptake assay in vitro and fluorescence imaging in vivo and the amounts of Biotin-PEG-DSPE were optimized accordingly. Hypocrellin B (HB), a novel photosensitizer was then encapsulated in biotinylated polymeric micelles and the anti-tumor efficacy was evaluated systemically in vitro and in vivo. The results showed that micelles with 5 mol % Biotin-PEG-DSPE demonstrated the best targeting capability than those with 20 mol % or 0.5 mol % of corresponding materials. This formulation has a small particle size [mean diameter of (36.74 ± 2.16) nm] with a homogeneous distribution and high encapsulation efficiency (80.06 ± 0.19) %. The following pharmacodynamics assays showed that the biotinylated micelles significantly enhanced the cytotoxicity of HB against tumor cells in vitro and inhibited tumor growth in vivo, suggesting a promising potential of this formulation for treatment of pancreatic cancer, especially those poorly permeable, or insensitive to radiotherapy and chemotherapy.

Objective To evaluate the molluscicidal effect of Rongbao in schistosomiasis endemic areas in Mianyang City. Methods Three Oncomelania hupensis snail habitats with the similar snail status were selected and sprayed with Rongbao,ni-closamide,and fresh water,respectively. Then the snail status in the three fields was surveyed before the spraying and 7,15,30 and 60 days after the spraying,and the molluscicidal effects of different molluscicides were compared. Results The reducing rates of densities of living snails in the field sprayed with Rongbao were 94.4%,95.9%,98.2%and 98.8%,7,15,30 and 60 days after the spraying,respectively. The reducing rates of the densities of living snails in the other field sprayed with niclosamide were 94.0%,94.0%,89.9%and 92.2%in above-mentioned days,respectively. In the 30 days and 60 days after the spraying,the reducing rates of densities of living snails in the field sprayed with Rongbao were significantly higher than those sprayed with ni-closamide(χ230 d=8.18,χ260 d=3.97,Both P<0.05). Conclusion The short-term molluscicidal effect of Rongbao is similar to that of niclosamide,but the long-term effect of Rongbao is better than that of niclosamide.

Objective To explore the differences of gene expression of peripheral blood mononuclear cell (PBMC) between the anti-cyclic citrullinated peptide antibody (ACCPA) positive and ACCPA negative patients with rheumatoid arthritis (RA) by microarray analysis.Methods Total RNA was extracted from PBMC of 5 ACCPA positive and ACCPA negative patients with RA,and age-and sex-matched control subjects respectively.Ⅲumina oligonucleotide microarray was used to characterize 47231gene expression profile for each sample.Results Among the target genes,88 differentially expressed genes were identified in RA patients.Fifty-one up-regulated genes and 37 down-regulated genes were found in RA patients compared to those in control subjects (fold change＞1.5).The differential expression of genes were associated with apoptosis,cytokine,signal identification protein,chemotaxis factor etc.There were 20 differential expression genes between the ACCPA positive and ACCPA negative patients with RA,9 up-regulated genes and 11 downregulated genes were found.The differential expression genes were associated with protein biding,,translation control,signal identification protein,cell cycle,metabolism etc.Conclusion There are differential gene expression between the ACCPA positive and ACCPA negative patients with RA.Genes screened from the target such as IFI,KIR,CHI3L1 can provi-de important information for further study and treatment of RA.

Objective To investigate the value of Q-analysis real-time elasticity in differentiating between benign and malignant thyroid nodules. Methods Eighty-six thyroid nodules in 62 patients with pathologic diagnosis were included in this study and were examined using Q-analysis real-time elasticity. The real-time elasticity features were observed and the quantitative index including the whole elasticity rate and the local elasticity rate were compared between benign and malignant nodules. Results There were 51 benign and 35 malignant nodules according to histopathological examination. The Q-analysis curve of real-time elasticity of benign nodules was smoother and with lower peak, compared with that of malignant nodules. The whole elasticity rate of malignant nodules were significantly higher than that of benign nodules (3.59±0.84 vs 2.32±0.56, P=0.000). And the local elasticity rate of malignant nodules were significantly higher than that of benign nodules (3.96±1.32 vs 2.39±0.58, P=0.000). The cutoff point of whole elasticity rate for the differential diagnosis was 3.25 with sensitivity, specificity and diagnostic accuracy as 71.4%, 96.1% and 86.0% respectively. The cutoff point of local elasticity rate for the differential diagnosis was 3.45 with sensitivity, specificity and diagnostic accuracy as 68.6%, 96.1% and 84.9% respectively. The diagnostic efficiency of whole elasticity rate and local elasticity rate had no significant difference (P=0.591).Conclusions Q-analysis real-time elasticity could provide the real-time elasticity features of thyroid nodules. The whole and local elasticity rate as the quantitative index contributed to the differential diagnosis of benign and malignant thyroid nodules.